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Improvement of Impeller Blade Structure for Gas Injection Refining under mechanical stirring

Journal of Iron and Steel Research International 2014年第2期21卷 135-143页

作者： Yan LIU Zi-mu ZHANG Sano MASAMICHI Jun ZHANG Pin SHAO Ting-an ZHANG Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern University Nagoya University

Abstract： The impeller blade structure for gas injection refining under mechanical stirring has been explored by water model experiments. A sloped swept-back blade impeller is＇proposed for the purpose. The central part of the impeller is disk- or plate-shaped, and the blades are fitted to the side of the disk or plate. In addition, a disk is put on the top side of the impeller blades. The impeller can strengthen the radial and downward flow between the blades and weaken the swirl flow in the zone above the impeller. These effects on flow phenomena are favorable for disintegration and wide dispersion of bubbles which are injected from a nozzle attached to the center of the underside of the impeller. In addition, the sloped swept-back impeller requires less power consumption. The impeller shaft should be placed away from the vessel center so as to disperse the injected bubbles widely in the bath under mechanical stirring even with unidi- rectional impeller rotation and without installing baffles. The number of gas holes in the nozzle and the direction of gas injection have a little effect on the bubble disintegration and dispersion in the bath. Highly efficient gas injection refining can be established under the conditions of proper impeller size, larger nozzle immersion depth, larger eccen- tricity and rotation speed of the impeller. The sloped swept back blade impeller can decrease the power consumption and vet improve the bubble disintegration and wide dist^ersion in the bath.

关键词： gas injection refining cold model eccentric mechanical stirring impeller structure power consump-tion bubble disintegration bubble dispersion

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Cold Model Study on Mg Desulfurization of Hot Metal Under mechanical stirring

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Journal of Iron and Steel Research International 2013年第12期20卷 1-6页

作者： LIU Yan ZHANG Zi-mu LIU Jian-nan ZHANG Jun-hua Masamichi Sano ZHANG Jun Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern University Beijing Institute of Technology Dalian University of Technology Nagoya University

The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble＇s dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers.

关键词： gas injection refining eccentric mechanical stirring bubble disintegration bubble dispersion volumetric mass transfer coefficient Mg desulfurization hot metal

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维普期刊数据库

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mechanical stirring for highly efficient gas injection refining

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Transactions of Nonferrous Metals Society of China 2011年第8期21卷 1896-1904页

作者：刘燕张廷安佐野正道王强任晓冬赫冀成东北大学材料与冶金学院多金属共生矿生态化利用教育部重点实验室沈阳110006 日本名古屋大学

In gas injection refining processes,wide dispersion of small bubbles in the bath is indispensable for high refining *** mechanical stirring with unidirectional impeller rotation was tested using a water model for pursuing better bubble disintegration and *** of various factors on bubble disintegration and dispersion were *** factors were stirring mode,eccentricity and rotation speed,nozzle structure,nozzle immersion depth,and gas flow *** injection from a nozzle at the end of the impeller shaft and from an immersed lance was *** eccentric stirring,a vortex was formed away from the *** bubbles were produced in the strong turbulence or high shear stress field near the rotating impeller and moved in the direction to the vortex keeping up with the macroscopic flow induced by the mechanical *** small bubbles could disperse widely in the bath under eccentric stirring with unidirectional rotation.

关键词： gas injection refining eccentric mechanical stirring unidirectional impeller rotation bubble dispersion bubble disintegration macroscopic flow

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维普期刊数据库

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新型喷气机械搅拌法的气泡微细化水模型实验研究

新型喷气机械搅拌法的气泡微细化水模型实验研究

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第十六届全国炼钢学术会议

作者：刘燕张廷安豆志河吕国志邵品任晓冬赫冀成东北大学材料与冶金学院

喷气精炼过程中,高速喷入的气流在熔池内部形成大量的大气泡,熔池内部的气泡微细化程度对提高精炼效率具有重要的意义。本文进行了新型机械搅拌法的气泡微细化水模型实验研究,即利用高速摄像,数码摄像及image图像处理技术来研究搅拌模式... 详细信息

喷气精炼过程中,高速喷入的气流在熔池内部形成大量的大气泡,熔池内部的气泡微细化程度对提高精炼效率具有重要的意义。本文进行了新型机械搅拌法的气泡微细化水模型实验研究,即利用高速摄像,数码摄像及image图像处理技术来研究搅拌模式,搅拌转速,喷嘴结构,转动模式及喷吹速率等对气泡微细化程度以及气液相间吸收规律的影响。研究表明正-反,正-停等搅拌模式能有效的提高熔池内部的气泡微细化程度,搅拌桨旋转产生的强大的湍动能和剪切应力能进一步破碎气泡。另一方面,水模型实验证明偏心单向搅拌更有利于提高熔池内部气泡微细化程度。同时,提高搅拌转速也可增强气泡微细化程度,气体喷吹和搅拌桨搅拌的相互作用对提高气泡微细化程度有着重要意义。

关键词： gas injection refining bubble disintegration and dispersion eccentric mechanical stirring forward-reverse rotation

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